Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a712f3a3344fb05…

MALICIOUS

PDF

41.4 KB Created: 2020-03-25 02:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 971b4cb03232650399ee6613f6640e03 SHA-1: ed50fbb8d14e6cd0857796189126fcd7d5fa8deb SHA-256: 8a712f3a3344fb053e00eb7f3f4d668c5e0535542b99be09ec9e230c3f72755a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body text is largely unreadable binary data, but the presence of numerous external links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://klokkeraadgivning.com/uploads/1/3/1/0/131070313/131070313.html#musculo+que+esta+entre+el+cuello+y+el+hombro PDF link annotation
    • http://kemafamilyptyltd.com/uploads/1/3/0/4/130436450/938459caf06fa78.pdfIn PDF document text
    • http://mhentscheldesigns.com/uploads/1/3/0/2/130273799/8bd6c68383f99.pdfIn PDF document text
    • http://120lakeshoredrive.com/uploads/1/3/0/6/130604685/8926591.pdfIn PDF document text
    • http://m3det6.com/uploads/1/3/0/7/130775203/karasa.pdfIn PDF document text
    • http://mta-sts.ciarakidder.com/uploads/1/3/0/6/130621098/tiporan.pdfIn PDF document text
    • http://mail.celebratinggodscreation.com/uploads/1/3/0/4/130436007/ronamubowud.pdfIn PDF document text
    • http://midwesthomesteadsupply.com/uploads/1/3/0/8/130873965/sajalarefijovujerud.pdfIn PDF document text
    • http://demolitioninphoenixaz.com/uploads/1/3/0/6/130621581/nurixibalal.pdfIn PDF document text
    • http://vesuviusisforlovers.com/uploads/1/3/0/5/130543798/muzusigituga.pdfIn PDF document text
    • http://playtherapyonlinetrainingacademy.com/uploads/1/3/0/2/130288348/a65e2c474.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 7976 bytes
SHA-256: f4c0f20afc1741f7ce96cde28c78e288e073c6d49ad37fa18b4f7113c69c793a
font_01_sfnt_off00008973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8973 4144 bytes
SHA-256: 885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da

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