Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2647e80bd233a6…

MALICIOUS

PDF

102.9 KB Created: 2021-04-01 15:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: a2210beb7b2b0389d862727d88aab9b3 SHA-1: 99f472e27c49a4d43220e67b578f58a87981aed5 SHA-256: 4e2647e80bd233a6c0df078e9f68053b0bc7d199a87809bf67257934e1700e0a
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 and link farms, indicating a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/award?keyword=ad+architectural+digest+france+septembre+octobre+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/sawitofi/ciTKyzF/xofoga.pdfIn PDF document text
    • http://help-ruleviolation.com/964457456854q4cz.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/1931824.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/ghslhcb/gujak.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/lanuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/ihgejg9/11555851871.pdfIn PDF document text
    • http://twoup-viktoria.online/gumball_copycats_dailymotion2fp7k.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/dIgdoJC/nifal.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/33956345204.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/ghgPari/62489195925.pdfIn PDF document text
    • http://epipog.com/baby_gate_for_stairs_with_metal_banister_on_one_side2pfdp.pdfIn PDF document text
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/pawinatigusuvemag.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://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_e7f9d33be72a46d896462b222cdc0749.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_2d683ffda0264e96a0048da992fb4766.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_47f4cae2e56348959a27a4c5ec164ab0.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_548c79d849c44ef49ef55a74caa7f451.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_687635dc9ff3458abb7282799e36a11a.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_cd395fa3e3d5487a9178edfcab1d60df.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_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 5852 bytes
SHA-256: 55915ba31610f059be0eb4d7db5e3e44aedd29e8d1cd7f7cc7691d54cf1f1c9a
font_01_sfnt_off00015397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15397 13324 bytes
SHA-256: eebc52865752bb17a6b408772c07728b142ddd1365aaf2ff186fdccdf94ddc53
font_02_sfnt_off00017d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D47 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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