Malicious PDF — malware analysis report

Static analysis result for SHA-256 53440d6b1fd39010…

MALICIOUS

PDF

36.6 KB Created: 2020-03-13 07:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 54a220ec495c08de6ed4529f44a930e6 SHA-1: f81112b396b846583922ad98ee7c736a07ef4f95 SHA-256: 53440d6b1fd39010b2dc447d5187eff3e51410693643e702cb4696f94ff32e0b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains a reference to a URL which is also present in the list of extracted URLs. No scripts were extracted from this sample. The primary attack pattern involves redirecting users to a multitude of external resources.

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://socalasta.voyagerwebsites.com/uploads/1/3/0/7/130739059/130739059.html#what+are+the+3+phases+of+general+adaptation+syndrome PDF link annotation
    • http://jerryhickson.org/uploads/1/3/0/7/130775174/wadureguzuko.pdfIn PDF document text
    • http://myladykarma.com/uploads/1/3/0/2/130288775/a0b39fdbd8dec4.pdfIn PDF document text
    • http://www.freetobefilthy.com/uploads/1/3/0/5/130589019/venupuwufigi_lomuranuwevaw_zuserurijufa_nowijubub.pdfIn PDF document text
    • http://www.biobreakfast.co.uk/uploads/1/3/0/2/130272295/vevetulujitikofuras.pdfIn PDF document text
    • http://7hjwr.rhsdb.com/uploads/1/3/0/9/130969445/kixoni-wimonewised-gopakaja-situgokijed.pdfIn PDF document text
    • http://reifierentertainmentdevelopment.com/uploads/1/3/0/7/130740174/jitugixizafa.pdfIn PDF document text
    • http://123-give.com/uploads/1/3/0/2/130288534/xusunerekipepupule.pdfIn PDF document text
    • http://www.haywardtrackandfieldcoaching.com/uploads/1/3/0/5/130550891/02f0edfa.pdfIn PDF document text
    • http://rostelekomrt.space/uploads/1/3/0/4/130476732/mavevu-bejezebazip-govadajabatus.pdfIn PDF document text
    • http://basikglow.com/uploads/1/3/0/5/130588389/tuxifazowexiwon_refikizor.pdfIn PDF document text
    • http://ngorongorocraterlodge.net/uploads/1/3/0/4/130476632/32a79c39ccc.pdfIn PDF document text
    • http://speculos.ca/uploads/1/3/0/6/130621162/lepimaj_rijamikuwesapu.pdfIn PDF document text
    • http://greatlakesdairygoatjamboree.com/uploads/1/3/1/0/131069897/6684540.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 7228 bytes
SHA-256: 4e6f8c6b16c26fd306dc1427bffb791a6c939d1c45406f291f275b7aa18ecef0

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