Malicious PDF — malware analysis report

Static analysis result for SHA-256 8773efe11a1827cf…

MALICIOUS

PDF

85.2 KB Created: 2021-03-16 13:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1859fd3aac05030d42c8bcaca530866e SHA-1: e432b16bcc7275174d2e11769bb282fb58b33b24 SHA-256: 8773efe11a1827cf1d27f4ef1e6720db0d457385b5c29ec733a2e0bb0bb8da00
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=seismic+data+processing+pdf
    • http://zoo-taxi.site/android_16_speech_to_gohand2ifr.pdf
    • http://bestcreditcheck.info/kokofuwipubomarulimok4m0bh.pdf
    • https://cdn-cms.f-static.net/uploads/4404497/normal_600f1e9ed692d.pdf
    • https://cdn-cms.f-static.net/uploads/4426547/normal_600c9c43f3150.pdf
    • http://boomua.site/lugukugadodazuwulotokaj8fr5x.pdf
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5fce9c136cfef.pdf
    • https://static.s123-cdn-static.com/uploads/4370270/normal_5fe0ef85ebbaa.pdf
    • http://liketsven.xyz/tudukerolagavuzit7kgud.pdf
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fee21d2c89fd.pdf
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/390427.pdf
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/fereforigoxudin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wapabefizosumi/prism_minimal_powerpoint_template_builder_free.pdf
    • https://s3.amazonaws.com/vibuvomomuv/67010834164.pdf
    • https://uploads.strikinglycdn.com/files/8c28dc9d-c1b7-4c5b-a202-b01d8f255cf9/aristotle_nicomachean_ethics_book_3_analysis.pdf
    • https://uploads.strikinglycdn.com/files/09440042-531c-41f2-b322-4421805692e4/bagudovoruselisu.pdf
    • https://uploads.strikinglycdn.com/files/d2b545ed-e550-4e0d-93e1-a7fa4e4ad62d/how_to_do_grounded_theory_coding.pdf
    • https://uploads.strikinglycdn.com/files/d2c6fd83-cc36-4039-b5fb-e19d1612e64d/labudad.pdf
    • https://uploads.strikinglycdn.com/files/f4e048a2-655d-434b-924f-6bc7773e573c/xodegesabelukari.pdf
    • https://uploads.strikinglycdn.com/files/f61e9181-a11c-4f41-a844-92d0149ab94b/the_woodcock-johnson_iv_test_batteries.pdf
    • https://s3.amazonaws.com/liwafo/gitufegololaweboxixegodit.pdf
    • https://uploads.strikinglycdn.com/files/522d7fac-db3b-4271-ae2d-b4b3ada79c80/66602177205.pdf
    • https://uploads.strikinglycdn.com/files/a55cb60b-e798-435d-afc5-b94eafcd23e7/what_to_say_instead_of_itll_be_okay.pdf
    • https://uploads.strikinglycdn.com/files/2f7d9795-d918-4a25-999b-70f296097f30/how_much_horsepower_does_a_jeep_grand_cherokee_srt8_have.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007e.bin
c9f3f66b214c4b559249808ca71304da96e11f6f96271929caa72659986276ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 5332 bytes
font_01_sfnt_off0001127d.bin
ccf5b7be91b5083d97f7c204aec1e9895bb53442b0e972dd7a5c184f2b801ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 11344 bytes
font_02_sfnt_off0001390b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 4324 bytes

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