Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eae817ed6d7c72…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 13:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1b4a54df5571c6e039d54cc52bc5ce4b SHA-1: ff83b1842cde0e511d339ece23baccb6680f0821 SHA-256: 85eae817ed6d7c72be73c50c3fcbdd77624c7e79f2f951ff01e0b7d220ebfa14
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a malicious redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=spanish+speaking+countries+and+capitals+quiz+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_600a0936f1994.pdfIn PDF document text
    • http://kersita.fun/77390346851u65z0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_6009c7850131a.pdfIn PDF document text
    • http://trokot-shtorki.online/40792041942wl94c.pdfIn PDF document text
    • http://ionatr.space/kusepizavesipaperama34urq.pdfIn PDF document text
    • http://organicnu.info/12195720164g6poh.pdfIn PDF document text
    • http://openchambre.xyz/56038976190zsft7.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/4._what_are_the_different_abbreviations_for_the_different_measurements.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/faxogesomulitod.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/batejanedanofedewakinij.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/pefaput.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/xuxulojelifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495691/normal_5fc8660ac2613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495531/normal_5fe5b23f872eb.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/bissell_crosswave_pet_pro_2306a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_a8a3f565f0cd47f0849041f989bb1fc2.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_c2c4be2782294acf9c530ce8b72d3140.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/80473233584.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/zusodunene.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_fe36d74c5f714777849ce964a4b3031f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saxefi/32311029967.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/7971218632.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/link_picsart_full_pack_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 5760 bytes
SHA-256: f3d5ad53fb75e7a9debb4494ee655429f320b763b117b6d75a81b825ef4575ee
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 14092 bytes
SHA-256: c4c943fe12d8243c86bc4e5341e841452fa29cdf332738d2b019249a957e33d2
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16388 bytes
SHA-256: 2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204