Malicious PDF — malware analysis report

Static analysis result for SHA-256 789871c32b5546be…

MALICIOUS

PDF

80.8 KB Created: 2021-03-12 11:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 232cbbecefc436f218ad7cc2b004307e SHA-1: 7db279f4e5dfd4511b4bec906496d1597ecce47d SHA-256: 789871c32b5546bec8d84c3039620dc055f834979162243b67b3049612ba49d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/award?keyword=biznesowy+s%25C5%2582ownik+tematyczny+angielski+pdf PDF link annotation
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/delaxujoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/hig9ifE/tap_tap_fish_mod_apk_1._14._0.pdfIn PDF document text
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/bixebajuweneg.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/iqjbFxi/driving_car_without_oil_damage.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/TijDegf/dune_book_review_common_sense_media.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/redukemap.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/32pvhdU/word_chums_customer_support.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/sazeros.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/d4b2383f0535e.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/pusajamu.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/e0cfb6272f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fc04f24e-a18d-455f-934d-c93d53bcec73/45145213126.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_f2f3d5d114484c7e96c27500c5302e9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6323dec5-2e08-4253-b7f1-f3e32364a3e5/bemusupekibotijaxojixenij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe8f25a-0607-4e4f-820e-234e0af23b91/96422827987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b530ed45-f512-41cd-b363-671a6dd25d9a/lizipepotilulojop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d84aea3-c679-4dd7-bd22-75384b28a4d3/asus_memo_pad_7_lte_att.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_f8dfec7e3b404a1a8f8a208aebe1ffb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22970b75-6c45-480f-a33a-58b824605310/cosco_folding_high_chair_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2360c9ac-116f-48af-9a31-a245460fd372/fugiweranufasadux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2346d265-a3a9-4b7e-981d-0d12c20f5fb6/xotoravukitelonopofag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ee1a18-02fc-4215-9c92-05a02d8a9ab9/best_tasting_heat-tolerant_tomato.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_f37c7d277b70472c9c8b747bc5c6811f.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_582d9e16efb84749be48c7abed2e54bd.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_7b7357fd19be4c18982433f4112843fd.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5580 bytes
SHA-256: 6300d95830d3706dc921aa8d62bf53eaf3809b535bc402df523bb7db5d54a880
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 11604 bytes
SHA-256: 06fcd32796adbf80fe8fc5995f95251287f86dad7c1c3ffc83291769891829f2
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f