Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7850819e911d11…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 18:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a50948b3d987b2f94730a388abf3c147 SHA-1: 7093756e957f03eb325ce44470fc3f3509bb11be SHA-256: dd7850819e911d115b71095c871d1adf53f0ecf4dfcc55d0515170aa5937225b
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 domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=major+historical+events+in+colombia PDF link annotation
    • http://baltika-trans.ru/lg_4g_lte_price_in_kenyai5nml.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/medarutujizo_nedanamizizo_gofapupi_kebalamim.pdfIn PDF document text
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/0618ee3.pdfIn PDF document text
    • http://rabota-plus.club/free_bible_english_standard_versiond5bp0.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/vositexuborajesoda.pdfIn PDF document text
    • http://aycotoro7.xyz/81155194118ocbac.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/1512958.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/nokebig.pdfIn PDF document text
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/lirebejelesu.pdfIn PDF document text
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/wokamer_savazame_giwusi_nukawezesobugef.pdfIn PDF document text
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/4407100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd56c11-f505-4d0e-a35c-6afe5f0fe2a2/hp_laserjet_p2055dn_driver_mac_os_x_10.12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4141d230-5cb1-43ae-898b-5575a0b5b87a/easy_indian_vegetarian_dishes_for_potluck.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/6mm_creedmoor_load_data_berger.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/material_safety_data_sheet_for_diesel_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a335433b-d780-4327-8ef1-037dd7365a5e/osprey_atmos_65_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/innovators_dilemma_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/hollywood_movies_english_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861e579a-0fde-4ea7-81ad-0fa45dafe0aa/song_of_solomon_chapter_13.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 5320 bytes
SHA-256: 8e099a5e389e6128b724a4723a9b02c9b4d57674755b5fd9eced3c10cd086222
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10280 bytes
SHA-256: 64ff6388bbb97507b0c8500262073cc0d0fa08c37d3c0d87799b45272f7644fd