Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd78887b37c7f62…

MALICIOUS

PDF

51.9 KB Created: 2020-04-02 11:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 9caf1cabe5d4b2e0968e71553bc64c74 SHA-1: 8d7fd76e07f1f47ef791b253698ac66a3de63d74 SHA-256: 4bd78887b37c7f62057092e8bb306d377108e5ce69cad719129021928c645189
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on similarly structured domains. This suggests a link farm or redirection scheme designed to drive traffic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the extensive use of external URLs indicates a likely attempt to lead the user to malicious content or phishing pages.

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://startupsummersfl.com/uploads/1/3/0/4/130483350/130483350.html#matrix+multiplication+complex+numbers+calculator PDF link annotation
    • http://masteringlifeandrelationship.com/uploads/1/3/0/7/130776219/puridevuv.pdfIn PDF document text
    • http://linxnw.com/uploads/1/3/0/3/130379529/kubeke.pdfIn PDF document text
    • http://houseofadonia.com/uploads/1/3/0/6/130604229/7730555.pdfIn PDF document text
    • http://bigd401k.com/uploads/1/3/0/6/130604580/5878063.pdfIn PDF document text
    • http://flighttrainingmentor.com/uploads/1/3/0/6/130640013/xevuziberefad.pdfIn PDF document text
    • http://vacuumexcavationsunlimited.com/uploads/1/3/0/4/130483680/6691874.pdfIn PDF document text
    • http://kempercpa.org/uploads/1/3/0/7/130738755/153211.pdfIn PDF document text
    • http://jpshealandscape.com/uploads/1/3/0/2/130289461/josove-mesifoxoz-rixuwepavenizu.pdfIn PDF document text
    • http://wellnessembodiedhealth.com/uploads/1/3/1/3/131398335/samufofijoveme-dapoj-boxudexujideziz.pdfIn PDF document text
    • http://melbournehotelplaceholder.devsite-1.com/uploads/1/3/0/5/130590464/potona.pdfIn PDF document text
    • http://tetrand.com/uploads/1/3/0/6/130639700/lajukedenukixi.pdfIn PDF document text
    • http://thepowderconnection.com/uploads/1/3/0/4/130436108/b2012815c.pdfIn PDF document text
    • http://wyndapp.com/uploads/1/3/1/1/131164496/tabaja.pdfIn PDF document text
    • http://californiaapprovedpipespecialist.com/uploads/1/3/0/5/130550706/2ee93e64302727.pdfIn PDF document text
    • http://eatwellwithmir.com/uploads/1/3/0/6/130603764/16d00e7.pdfIn PDF document text
    • http://sarahpounds.com/uploads/1/3/1/3/131381720/ddb1810c.pdfIn PDF document text
    • http://nourks.com/uploads/1/3/0/5/130589150/9797701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB8 9172 bytes
SHA-256: c3b926bb3c5ba99b73bf9838e527dd7393a5f56181e67dbccd23ea2debac7570
font_01_sfnt_off0000a1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B6 2988 bytes
SHA-256: 4fa858b82b445805eff69b872cfcae0b273ce6c644f001a2365b71733efe32ff
font_02_sfnt_off0000ac48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC48 16084 bytes
SHA-256: cc8869df30b71529a912fc72de00b939142552c09d00531f0c65a87d7f1fa33b

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