Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f005f30b45333c…

MALICIOUS

PDF

66.1 KB Created: 2021-02-13 10:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 94a109b8b2b64a9bc1744a0f91304773 SHA-1: eeb803dcfbb50c6d6e9d8f62f838f46de6f49b36 SHA-256: 84f005f30b45333c9880ac6efb1b90cb4ee7005327d0c067dd53e26fdb085455
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'tutorial excel 2007 pdf', indicating a lure to disguise the malicious intent.

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://leonvi.ru/aws?utm_term=tutorial+excel+2007+pdf PDF link annotation
    • http://rogumim.iblogger.org/ascorbic_acid_in_pharmaceutical_dosage_forms.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/9e2575.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/venolarewexiwupiziju.pdfIn PDF document text
    • http://sitakog.iblogger.org/24495648292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_6007d2a18e22f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417807/normal_5fe35d82b47e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fe1f58fb404f.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/gowoxidonez_fofenim.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/94c59.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/kovovogukad-kejiweza-fabanuki-bomufuwij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5fe9c6bf89e5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momesesewoja.rf.gd/1651076161.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/bewamawinibivi.pdfIn PDF document text
    • http://xifupoxenopi.epizy.com/69547593529.pdfIn PDF document text
    • http://xesufiwonelu.epizy.com/sheet_metal_folding_machine_hire.pdfIn PDF document text
    • http://deketinak.rf.gd/40900359891.pdfIn PDF document text
    • http://kobuxeniduf.rf.gd/zigegevipimomegesugene.pdfIn PDF document text
    • http://faxunarin.epizy.com/xipiburukiwonarisari.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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 5340 bytes
SHA-256: a66a24891ed446c8240a5e97338c6ea019e299513b01192c199b62f1d6028096
font_01_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 9636 bytes
SHA-256: 78c740f14bdd8af7e4d8009165adafd9faf456ed782356ba9e8b2b12fa2e68d6

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