Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c682ba5de30c5c2…

MALICIOUS

PDF

39.7 KB Created: 2020-04-01 22:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2525319a3f2c07f87b7c20b2b61fc9a9 SHA-1: 46dabbc963dae570eeda8a0695bfd6f7f4d9b733 SHA-256: 5c682ba5de30c5c2c9683bd706fb875665b844c15cc935642fb12ff2b2a983c4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body, though partially corrupted, includes a URL that appears to be a lure for a 'literary devices worksheet'. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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://rebeccalaplacaattia.com/uploads/1/3/0/6/130605080/130605080.html#literary+devices+worksheet+10th+grade+pdf
    • http://esportsfloors.com/uploads/1/3/1/3/131397987/delegid.pdf
    • http://americarevolt.org/uploads/1/3/0/3/130313053/divupovate_dikujot_zafifozebiwadav_fomegavi.pdf
    • http://ezschoolsupply.org/uploads/1/3/0/2/130273907/volukabuzimo.pdf
    • http://kendaltaylor.com/uploads/1/3/0/5/130550828/7083017.pdf
    • http://suzie100.com/uploads/1/3/1/0/131070160/5717915.pdf
    • http://intesamma.com/uploads/1/3/0/2/130271028/futadapiwarofaz_wuvoso_jebakiwozatu.pdf
    • http://hostmaster.burkebros-cheltenham.co.uk/uploads/1/3/0/8/130874583/masamutu-fatijegeviva.pdf
    • http://100phrases2freedom.com/uploads/1/3/0/5/130544823/ce2ebb95912559.pdf
    • http://americanwebloaninvestigation.com/uploads/1/3/0/7/130738730/577161.pdf
    • http://dotradio.org/uploads/1/3/1/4/131438432/f436381574.pdf
    • http://12ministries.org/uploads/1/3/0/4/130436343/75a9e2.pdf
    • http://conceptualteaching.com/uploads/1/3/0/3/130313388/e1da697cf0d5.pdf
    • http://massage-logic.org/uploads/1/3/0/5/130544547/4fd17a82237a04.pdf
    • http://internationalfilmbroker.com/uploads/1/3/0/4/130483376/kejekupal-satexozewefoje.pdf
    • http://grotasgroup.com/uploads/1/3/0/6/130603942/c69edcd09ee4cf.pdf
    • http://inner-muse-sculpture.com/uploads/1/3/0/7/130776875/geriwanaji.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_off0000735d.bin
d627247c82b39b741b7c80089c8765ea71518010bf7197d163e3c578c293d5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735D 7700 bytes

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