Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18854a6c0cd3cf8…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 23:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b8ac97cf402b3901f6b5841ab0b0018 SHA-1: 50a75d3b9e198df5f7b87d5dccc5e76676291bd5 SHA-256: d18854a6c0cd3cf8d66390f749d34f31ba56575656fca3ffc724322e23019098
156 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 other PDFs, suggesting a link farm or SEO poisoning attempt. The primary URL, https://lozipotod.ru/award?keyword=affirmations+for+self+esteem+pdf, is presented as a document related to self-esteem affirmations, likely a lure. ClamAV and ML classifiers strongly indicate malicious content, with ClamAV identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

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=affirmations+for+self+esteem+pdf
    • https://pusuxefemaj.weebly.com/uploads/1/3/4/1/134108889/sesakoxudedoped_repabivat_gupejemif_kigoxenab.pdf
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/garizifid.pdf
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/koxevegufalasatimuwo.pdf
    • http://ndfnasg.xyz/abrsm_singing_diploma_syllabus_performancea5kru.pdf
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/7267831.pdf
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/b92e910.pdf
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/236d2f.pdf
    • http://nenodipemuxok.mypressonline.com/46029611780.pdf
    • http://ch-redirect.icu/why_is_differential_association_theory_important2r0vx.pdf
    • http://reduslimitalia.site/72500463697wkyph.pdf
    • http://hangzhoumetal.ru/87618401869fcnjf.pdf
    • http://metryck.info/47156852521q1liw.pdf
    • http://jefevivavifax.scienceontheweb.net/62347643275.pdf
    • http://fruittea.space/tasurigetovoxusoxuwogodji3.pdf
    • http://mxbur.fun/totuloravusisexiretftcvh.pdf
    • http://vogudikomi.getenjoyment.net/80542862944.pdf
    • http://totaxusozavu.sportsontheweb.net/research_article_writing_format.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/devuxuzejozam/26451594982.pdf
    • https://s3.amazonaws.com/gasodamuza/zonajizozuneroxazor.pdf
    • https://s3.amazonaws.com/gedesisumi/71053010912.pdf
    • http://wepogevadapafa.atwebpages.com/logic_games_lsat_practice.pdf
    • https://s3.amazonaws.com/xapijifas/gigowuverojidiboko.pdf
    • https://s3.amazonaws.com/dosalapasenow/wedesefowisijome.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_off0000f0ea.bin
230e2c94ab24bd42cf0f5e5b87c0106912d9dcc047d641c9ab5d62de74fa1329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 4964 bytes
font_01_sfnt_off000101a7.bin
60252631aef614567c945ae334c3206f489a251205d0100fb4d7b3bcdb01e97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10628 bytes
font_02_sfnt_off000125aa.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 4324 bytes

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