Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fd118d0236771d…

MALICIOUS

PDF

48.9 KB Created: 2020-03-14 13:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0db18050afcfa1c82c323a78a5ef3da SHA-1: 8f3194d625aee75aba7b9cd29a4f6ff6c4598367 SHA-256: 81fd118d0236771d4c486acf841965914404fa92dc69560ba3ed1868046bfbdf
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDF files. This suggests a link farm or SEO poisoning tactic, likely intended to drive traffic or host malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sarahgillprojectmanagement.com/uploads/1/3/0/6/130604241/130604241.html#management+report+examples
    • http://raidiousdigitalcontentservices.com/uploads/1/3/0/2/130291575/jedekefiru.pdf
    • http://storystew.org/uploads/1/3/0/6/130639241/nixujomafeguzuwaxige.pdf
    • http://bcssummerlanguagecamp.com/uploads/1/3/0/7/130739533/buxevoti-tokefuvufagoko-gibob-sugutakofa.pdf
    • http://thepaintedvinecellar.com/uploads/1/3/0/5/130544387/4d969fddb56b.pdf
    • http://www.sayuriyakitori-llc.com/uploads/1/3/0/6/130639148/c1fad82db372ca1.pdf
    • http://socialworkoutstudio.com/uploads/1/3/1/0/131070851/vilutuf_pabiduxibevu.pdf
    • http://peak-life-wellness.com/uploads/1/3/0/5/130545818/1412859.pdf
    • http://drugwar.org/uploads/1/3/0/3/130323707/pakab-zopojuju-merar.pdf
    • http://juliancert.com/uploads/1/3/0/7/130776026/be220ec16f.pdf
    • http://masterpeacepress.com/uploads/1/3/0/7/130740056/zazaxudavev.pdf
    • http://mccann.designpreviewer.com/uploads/1/3/0/5/130590036/4f279.pdf
    • http://leeclementsguns.com/uploads/1/3/0/2/130272350/a933d.pdf
    • http://elitehockeyleagues.com/uploads/1/3/0/6/130639624/5b1b8dc.pdf
    • http://grizzlyfunk.com/uploads/1/3/0/5/130589450/xifexijijegixuv_botokeboru_fokoviz.pdf
    • http://bojueyulechengkaihudizhi.f18.ebkf.org/uploads/1/3/0/2/130289729/e4e88.pdf
    • http://ctc-international.com/uploads/1/3/0/6/130603944/xudurigozujulo-wevelununu.pdf
    • http://delvallerealty.com/uploads/1/3/0/4/130483923/85b2ba2.pdf
    • http://autosmundiales.com/uploads/1/3/0/5/130588841/4726456.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009525.bin
fc9a5a72e89d8f2cd42197f4561ba4768a20d48e859c48d0d8901883c8151155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9525 8176 bytes

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