Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b53c354d5d897a…

MALICIOUS

PDF

50.8 KB Created: 2020-05-23 08:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7940b42bac132360cb98897e3d1d43c2 SHA-1: 9bde23eb11273f1e4260e5ffa3130d2d4df1eda2 SHA-256: 70b53c354d5d897af7f6747ce027b568534f18fe9558e456efb173c306bffdd9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains obfuscated text and URLs, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, but the sheer volume of external links points to a link farm or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rccollegeconsultants.com/uploads/1/3/0/5/130588225/130588225.html#how+good+is+google+home
    • http://rejdesigns.com/uploads/1/3/0/7/130739744/vofigudejijadu.pdf
    • http://theplainshotel.com/uploads/1/3/0/6/130640123/1993686.pdf
    • http://elegantmemories.org/uploads/1/3/0/5/130543476/a98ca16653f7511.pdf
    • http://galapagoknives.com/uploads/1/3/0/3/130323466/demeduxogixaj.pdf
    • http://bayspringsolutions.info/uploads/1/3/0/6/130603692/pitiperuwujizonefawa.pdf
    • http://homesteadcoin.org/uploads/1/3/1/0/131069978/wubadeg.pdf
    • http://mason-harvey.com/uploads/1/3/1/3/131380292/733585f8d74c5b.pdf
    • http://90210condos.com/uploads/1/3/0/7/130740357/80657b.pdf
    • http://bridgeadvantagevision.com/uploads/1/3/0/5/130590322/zoxugolop.pdf
    • http://lampionterbang.net/uploads/1/3/0/7/130739389/kevuvem.pdf
    • http://advancedentbellevue.com/uploads/1/3/0/2/130272395/7912153.pdf
    • http://4-hwesternheritage.com/uploads/1/3/1/4/131452958/noviduxiketoke_dinujikavov.pdf
    • http://pureblissbodyandbeauty.com/uploads/1/3/0/2/130288317/gugogodipog-vigogifimariva-rabeve-sasaxukab.pdf
    • http://axiomhealthtraining.com/uploads/1/3/0/7/130776371/gujok-vulesepevajesom-dafanuximodin.pdf
    • http://singlesip.com/uploads/1/3/0/7/130776055/zexin_sivujixamalot_dituzimep.pdf
    • http://transactionalcredit.com/uploads/1/3/0/4/130476844/vekejofa.pdf
    • http://mtnchicks.com/uploads/1/3/1/1/131163841/lesamubusovuzewi.pdf
    • http://godshouseofhealingandrestoration.org/uploads/1/3/0/4/130435955/sifodikitisuzax-fotamewozaneb-nazixug-tolonomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c98.bin
3cc0781561eb803babc9e52dc605e5292e794388803a6ae12767c730f325a663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C98 10348 bytes

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