Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8a9200e6034a65…

MALICIOUS

PDF

78.1 KB Created: 2021-05-15 21:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 36384a376797163a84806e68ad0e49c9 SHA-1: d6951dc834119bb3b97a5be34d2e6b618e1590ac SHA-256: 1b8a9200e6034a65cfbf7af78fe18acb453dbd32f7b7adbaff4cd7dc583fb3aa
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Balancing chemical equations worksheet answers'. No scripts were extracted, but the presence of external links and the overall heuristic firings strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=balancing+chemical+equations+worksheet+answers+1-20 PDF link annotation
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/tabatizuvesufepolam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482406/normal_6047b65349544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_6029e9f58925f.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/haJh3hg/connect_me_tmobile_login.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/idnhjgg/end_fed_all_band_hf_antenna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_6060f44911d96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5febb112754d6.pdfIn PDF document text
    • http://septiki-rf.website/baldor_grinder_manual0lwdf.pdfIn PDF document text
    • https://cdn.sqhk.co/fapulatonupe/aiejjL3/tik_tok_whatsapp_status_video_download_mp4_tamil.pdfIn PDF document text
    • http://sandiego-podcasts.com/kakebazuzotedojalsl2wn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_606e932309a06.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/9305359.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://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_69782236f3dd4723b12896bab219e8b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75730866-2cad-4389-978f-a843211a3ef3/51232000949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2993e54a-e499-404a-b1bd-773de1962353/glencoe_geometry_3-4_skills_practice_equations_of_lines.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4d8da9618b5e411fbdfa6e67793a57f8.pdf?index=trueIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_f329a689b968484fba6681888b63cd97.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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 5784 bytes
SHA-256: 64a7b5ba69bfea1559dcfebe56e40c915b60a2bb335912ad2a2218de41a3c2cc
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10600 bytes
SHA-256: 458185c949a06f41881fb3614d36e90b7f89ffde886ad1606c24f98ce33b86d2
font_02_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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