Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3bac3871aa4fdd…

MALICIOUS

PDF

93.6 KB Created: 2021-05-02 10:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32fd19530a5c85c623262dd6f8b7977d SHA-1: 80cf69c97c9f3520c92ada30f517b727e0ed112e SHA-256: 1d3bac3871aa4fdd7813f1895ad12f2e30cf53c6456ee6481565090ef5b032f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=plato%2527s+apology+of+socrates+pdf PDF link annotation
    • http://getdouche.xyz/phone_repair_on_polkwus41.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/8DI0jfC/wiripu.pdfIn PDF document text
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/tamejojofol_gomel_konuter_buxonosav.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/mR77ghl/the_silent_age_game_walkthrough.pdfIn PDF document text
    • http://bet-info.ru/how_to_install_xvid_codec_on_nvidia_shield9zzj8.pdfIn PDF document text
    • http://avto-document.site/fractional_and_negative_indices_worksheet_gcsea8ywn.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/ghDhbjg/sonny_and_cher_announce_divorce.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/reziz_baponupunigej.pdfIn PDF document text
    • http://allerlo.xyz/xodenebgnyz8.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/xifuxezalemi.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/mefezalajimokisokefu.pdfIn PDF document text
    • http://arthromedro.xyz/xiluwubep32ow.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/dibtmly/didi_food_delivery_brazil.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/93bee2a7-5db4-46f1-a8d5-b4f869e16f29/burton_raffel_beowulf_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26395b5f-9c6d-4979-8a25-1ac298c1047c/nlp_books_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d92f284-3730-4938-85a5-5f12050e352c/levevewerivulomixekim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea642bdf-8663-4cef-b95a-f013817402c1/jidivifurufaragika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de033a40-a24d-465d-baee-17189747cfd3/472228497.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_317ca6006ab6409586b70d17575530c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b354deee-19b8-446f-a778-d927833e980b/pls-5_standard_score_descriptions.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_89fce5dffef041d49d5fe45748c1b2df.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_7cc041df98cd4edea9d85f8930b3e056.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c93736-cf3d-49c2-aacc-a9032e4c3266/wilesotofomatukujale.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_8000e0e337bb4116bce051a05c856b00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22cf7dd-5664-4de6-904d-f31955836644/danger_love_story_telugu_movie_cast.pdfIn 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_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 5092 bytes
SHA-256: 6111c1a7dc465bf1d98e02815e999f983ba7c224e5f038e5348522ec72d40e82
font_01_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 10560 bytes
SHA-256: 30fdbd582915d701e7cb026666725b788ad985a5e8d61f0060020d3e0950ef22
font_02_sfnt_off00015a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A95 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361