Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d15358b30a9b778…

MALICIOUS

PDF

71.6 KB Created: 2020-11-10 03:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52d79cb4cabeebee7817722aa1e077f6 SHA-1: d9c3d8345ac61466e963b42a583c7f65aabfad0b SHA-256: 9d15358b30a9b77878ecba884d67a936322c7acc9efab4fc1fac302d61fc7ffa
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?keyword=2020-21+sat+test+dates PDF link annotation
    • https://lifesodoxeduze.weebly.com/uploads/1/3/4/3/134372712/repovun.pdfIn PDF document text
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/e3797ac.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/6369922.pdfIn PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/moguvorifetev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5fa9c70685f9b.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/timifemewo.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/111a6fcc6082.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/pugapezanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fa914675a9d4.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/4a8f6806-edca-4ec9-9b69-ecc33d56e79d/gajigonokuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ab4086-619c-4b79-95a5-1e5ae85a472e/bevuwiwogitepizesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cdb211-9b11-4b9f-b2da-7042c5dbc04d/5766788164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e20adf5-3f58-4aab-a988-58f702230abe/guvikunefigufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38008d9f-cde1-424b-9ed3-fe5a959bc5de/rokaxaronifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210df0e4-2e3c-4b42-917b-3a78b817bcf6/td_apps_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lujatolu/cinema_4k_apk.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 4476 bytes
SHA-256: 971ea16938cbdfb39c0adb139a04b1d2c694a2feacafdb22ff8a1d1fa6f2c77a
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10688 bytes
SHA-256: 692b95554c97f9c95bfbb24e326a814d5af0a7984f2ad10b175c9c73a5cb1da3
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c