Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57b5309476e31ab…

MALICIOUS

PDF

74.0 KB Created: 2021-06-09 17:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3925db7501665170d6453854aeb4d935 SHA-1: 3c997e08d01ac21d663cc78cd7c243bf4be8e3e2 SHA-256: a57b5309476e31aba1b96306bf1fe6ff0b4eedbf08d129039604853c0a0d2e10
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to 'sleep meditation for women', which is likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/pbw?utm_term=sleep+meditation+for+women PDF link annotation
    • https://buxefakoxu.weebly.com/uploads/1/3/4/7/134744428/337ad7033e5a.pdfIn PDF document text
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/vudokutidafaselereze.pdfIn PDF document text
    • https://mowozawufela.weebly.com/uploads/1/3/4/2/134234907/vadapezupere.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/tuzofijumanujel_lesuraziwumasap_kigatekugoneb.pdfIn PDF document text
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/xitovewubuvoxilaxes.pdfIn PDF document text
    • https://lumifuwuzuzeb.weebly.com/uploads/1/3/4/6/134698668/jigixolakej-runora.pdfIn PDF document text
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/kijobigok.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/xuvudexakux_zajuse_wuzebumoko.pdfIn PDF document text
    • https://luliguruj.weebly.com/uploads/1/3/4/8/134879099/1038081.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/12be02d5.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/2963775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_60620c26ed62b.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/zatowavenen.pdfIn PDF document text
    • https://zirivuso.weebly.com/uploads/1/3/1/1/131164479/vumadoka_xinujulowe_lomoba_rikowufegojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5ffd7fd3951ac.pdfIn PDF document text
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/586e2f1807.pdfIn PDF document text
    • https://fimopokiwuzik.weebly.com/uploads/1/3/4/7/134736862/416e68aab82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/790293e5-24b2-4ab0-869e-2f5c582fdc5f/do_outside_ac_units_have_reset_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8471c00-d665-4346-ba04-ec1942db94fc/ritiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83228c7b-bb16-4ddc-91e5-a852f197ce46/15319383321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f21b87-d467-4539-81ab-7ae67ad1d7b5/jamogo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 5204 bytes
SHA-256: e1228092a65e54c238ef1fb5c4485b018ab03c7d667af3fe122c706acd993eeb
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10436 bytes
SHA-256: 7dd8755b6d03bfd65f28f613919566ab289528ad808ecd3730891db4125de319