Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa71ec12841be828…

MALICIOUS

PDF

41.6 KB Created: 2020-04-01 16:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2108fe6cdeaab342959a2ec5eef833a8 SHA-1: 352b94b7f88ffea528e1d6cb075fb252fe409d52 SHA-256: aa71ec12841be828ab8741356772bdd59a7cc66a4ae81f42dddb6086ad42a0c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm designed to manipulate search engine results or distribute further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://yolandaluna.net/uploads/1/3/0/5/130588701/130588701.html#examples+of+possessive+adjectives+in+spanish
    • http://clearflowvalves.com/uploads/1/3/0/5/130588635/0e23619d.pdf
    • http://ranneyquestions.com/uploads/1/3/0/5/130588988/8873508.pdf
    • http://nspiritcoaching.com/uploads/1/3/0/2/130272283/06b262334d44.pdf
    • http://churchonthesquare.net/uploads/1/3/0/8/130815115/xodekimo-nipenefodarit-lifusaxoxo.pdf
    • http://lemontreegiftsstorecom.com/uploads/1/3/1/4/131408117/c996b91.pdf
    • http://thewallflowerwithwanderlust.com/uploads/1/3/0/6/130621387/cfb26080f.pdf
    • http://oweterminal.org/uploads/1/3/0/3/130379311/6982811.pdf
    • http://gardencritteracademy.com/uploads/1/3/0/8/130814921/c57784a5.pdf
    • http://technofreesundays.com/uploads/1/3/0/2/130288481/wesurato_tetijugofavaj_vekupimozuriv.pdf
    • http://canadiansafetyinstitute.org/uploads/1/3/0/4/130435581/safejatada.pdf
    • http://facepaintingnsw.com/uploads/1/3/0/6/130620575/1693742.pdf
    • http://livingworkfreedom.com/uploads/1/3/0/4/130489175/zezisirezudegu-pevomozi.pdf
    • http://nsanegriplegendcarscom.com/uploads/1/3/1/4/131438617/4287406.pdf
    • http://clearityinvision.com/uploads/1/3/0/8/130813698/pagefanefozigaw-nugojijoseparel.pdf
    • http://moosemanormi.com/uploads/1/3/0/4/130489240/1326246.pdf
    • http://chassjoyfitnessparty.com/uploads/1/3/0/2/130287242/simulesizumab.pdf
    • http://randiegley.info/uploads/1/3/1/4/131437833/lirib-zuvid.pdf
    • http://darrellourso.net/uploads/1/3/1/1/131164117/rinevigefet_sizeku.pdf
    • http://viciouzjewelzonline.com/uploads/1/3/0/9/130969294/8ab689edc5.pdf
    • http://applegateovercrossings.com/uploads/1/3/0/7/130775248/d2b94ca2f41f49.pdf
    • http://gymcoachmichelle.com/uploads/1/3/1/3/131380427/1714505.pdf
    • http://hawkeyfinancial.com/uploads/1/3/0/6/130604025/9b6658.pdf
    • http://deletetheanxiety.com/uploads/1/3/0/6/130620622/lovejurubanivuk.pdf
    • http://375harbor.com/uploads/1/3/0/2/130291373/zumotiwubipila-gupub-vobanelaweret.pdf
    • http://impressiverenovationsllc.com/uploads/1/3/0/5/130588830/6baa9.pdf
    • http://deletetheanxiety.com/uploads/1/3/0/6/130620622/lovejurubanivu
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b8.bin
21d1c71be00d13e9e8d1542f7cee5d3b5a73c5f338d95bbff318e3759d0fc295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B8 8852 bytes

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